Sir Anthony Morgan FRS (1621–1668) was an English Royalist politician and soldier. In the English Civil War he was first a Royalist captain and then in 1646 changed sides and joined the Parliamentary army. He was a captain in Ireton's horse (cavalry) in Ireland in 1649 and had risen to the rank of major by 1662. He was a Member of Parliament for the Irish constituency of Wicklow and Kildare in the parliaments of 1654 to 1658, and represented the Irish constituency of Meath and Louth in 1659. The Lord Protector Oliver Cromwell knighted him in 1656 and after the Restoration, he was also knighted by King Charles II in 1660. He was a commissioner of the English auxiliaries in France and an original member of the Royal Society in 1663.